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@jbsulli
Last active June 10, 2024 09:53
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Demo:

Spoiler warning

Spoiler text. Note that it's important to have a space after the summary tag. You should be able to write any markdown you want inside the <details> tag... just make sure you close <details> afterward.

console.log("I'm a code block!");

How to:

<details>
  <summary>Spoiler warning</summary>
  
  Spoiler text. Note that it's important to have a space after the summary tag. You should be able to write any markdown you want inside the `<details>` tag... just make sure you close `<details>` afterward.
  
  ```javascript
  console.log("I'm a code block!");
  ```
  
</details>

Credits:

dear-github/dear-github#166

@girng
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girng commented Aug 2, 2022

is there a way on how to put them inside a bulleted point list? I tried, but it looks funky

Updates:

Screenshot

img

@dexston
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dexston commented Sep 26, 2022

@girng using HTML format in one line
* <details><summary>Screenshot</summary><img src="https://fakeimg.pl/200"></details>

  • Screenshot

@girng
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girng commented Sep 27, 2022

@dexston oh nice, thank you!

@Jiab77
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Jiab77 commented Mar 8, 2023

For better spacing before and after the spoiler, you can prefix / surround the whole block by <p></p>.

You should get something like that:

<p>
<details>
<summary>Spaced spoiler</summary>

<!-- Markdown content here -->

</details>
</p>

And the result here:

Spaced spoiler
console.log('Hello world!');

Some text blah blah...

@tongyaop
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tongyaop commented Sep 8, 2023

It's possible to use markdown to embed image in spoiler but there must be a line break for some reason.

<details>
  <summary>Screenshot</summary>

  ![img](https://fakeimg.pl/200)
</details>

Screenshot

I have to do the same for my table. The indentation of the table in the markdown also determines the output

<details>
	<summary>spoiler alert: a table</summary>

| a   | b   | c   |
| --- | --- | --- |
| 1   | 2   | 3   |
</details>
spoiler alert: a table
a b c
1 2 3

<details>
	<summary>spoiler alert: a table</summary>

     | a   | b   | c   |
     | --- | --- | --- |
     | 1   | 2   | 3   |
</details>
spoiler alert: a table
 | a   | b   | c   |
 | --- | --- | --- |
 | 1   | 2   | 3   |

@phoenix-ua
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phoenix-ua commented Jan 31, 2024

Thanks everyone for sharing this!

@Jiab77
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Jiab77 commented May 20, 2024

@tongyaop The reason why you need to leave a blank line between the HTML used by the spoiler and the markdown code you are using for rendering the image is due to the parsing engine.

You can easily mix markdown with HTML (knowing that only a limited subset of HTML tags is supported) as long as you always leave blank lines in between to allow the parser to do its job correctly.

You can also replace your example by going full HTML and so, no need to keep blank lines.

It would look that way:

<details>
  <summary>Screenshot</summary>
  <img src="https://fakeimg.pl/200" alt="fake-img">
</details>

Which should render as follow:

Screenshot fake-img

If you ever need to center you image without using HTML code for rendering the image, you can do the following:

<div align="center">

![img](https://fakeimg.pl/200)

</div>

Which then should render that way:

img

You might then think "why not use the magic align="center" trick everywhere??"

Simply because this:

<img src="https://fakeimg.pl/200" alt="fake-img" align="center">

Would then render:

fake-img

So you can't use align="center" everywhere and as far I know, it only works with <div> and <h1> like tags and maybe <p> tags but nowhere else.

Now because, I'm curious, let's see if the following does work or not:

<details>
  <summary>Screenshot</summary>
  <div align="center">

  ![img](https://fakeimg.pl/200)

  </div>
</details>

Result:

Screenshot

img

Spoiler: It works! 😎

Hope to have been helpful and shared some useful insights about markdown parsing 🙂

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